<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="checkAll" />
    </label>
    <span>
      <span>已完成{{ complateNum }}</span> / 全部{{ allNum }}
    </span>
    <button class="btn btn-danger" @click="emit('clearComplate')">
      清除已完成任务
    </button>
  </div>
</template>

<script lang="ts">
import { defineComponent } from 'vue';

export default defineComponent({
  name: 'Footer',
});
</script>

<script setup lang="ts">
// 引入
import { todoListType } from '../../App';
import { computed } from 'vue';

// 接收传递过来的props数据
const props = defineProps<{
  todoList: todoListType;
}>();

// 接收自定义事件
const emit = defineEmits<{
  (event: 'checkTypeAll', checkType: boolean): void;
  (event: 'clearComplate'): void;
}>();

// 全部的数量
const allNum = computed(() => {
  return props.todoList.length;
});

// 已完成的数量
const complateNum = computed(() => {
  return props.todoList.reduce((p, c) => (c.done ? p + 1 : p), 0);
});

// 全选按钮的可读可写的计算属性
const checkAll = computed({
  get() {
    return complateNum.value === props.todoList.length;
  },
  set(checkType) {
    emit('checkTypeAll', checkType as boolean);
  },
});
</script>

<style scoped lang="scss">
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
